I don’t know if everyone already knows this but I found out that you can tranquilize the same female wyvern for an infinite amount of milk. It’s not instant but if you trap it, tranquilize it, get the milk, and just leave it in the trap for idk how long and come back you can do it over and over again I’ve kept a level 20 poison wyvern in the same trap for two days now. The only bad thing is I don’t think they heal the damage back so I use a snow owl to heal it right as it wakes up. I just wanted to share this cause the Yt videos I’ve seen never mention this method of getting wyvern milk.